{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2024-57979",
  "modified": "2026-10-07T17:22:01Z",
  "upstream": [
    "CVE-2024-57979"
  ],
  "published": "2025-02-27T02:06:37Z",
  "summary": "pps: Fix a use-after-free",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\npps: Fix a use-after-free\n\nOn a board running ntpd and gpsd, I'm seeing a consistent use-after-free\nin sys_exit() from gpsd when rebooting:\n\n    pps pps1: removed\n    ------------[ cut here ]------------\n    kobject: '(null)' (00000000db4bec24): is not initialized, yet kobject_put() is being called.\n    WARNING: CPU: 2 PID: 440 at lib/kobject.c:734 kobject_put+0x120/0x150\n    CPU: 2 UID: 299 PID: 440 Comm: gpsd Not tainted 6.11.0-rc6-00308-gb31c44928842 #1\n    Hardware name: Raspberry Pi 4 Model B Rev 1.1 (DT)\n    pstate: 60000005 (nZCv daif -PAN -UAO -TCO -DIT -SSBS BTYPE=--)\n    pc : kobject_put+0x120/0x150\n    lr : kobject_put+0x120/0x150\n    sp : ffffffc0803d3ae0\n    x29: ffffffc0803d3ae0 x28: ffffff8042dc9738 x27: 0000000000000001\n    x26: 0000000000000000 x25: ffffff8042dc9040 x24: ffffff8042dc9440\n    x23: ffffff80402a4620 x22: ffffff8042ef4bd0 x21: ffffff80405cb600\n    x20: 000000000008001b x19: ffffff8040b3b6e0 x18: 0000000000000000\n    x17: 0000000000000000 x16: 0000000000000000 x15: 696e6920746f6e20\n    x14: 7369203a29343263 x13: 205d303434542020 x12: 0000000000000000\n    x11: 0000000000000000 x10: 0000000000000000 x9 : 0000000000000000\n    x8 : 0000000000000000 x7 : 0000000000000000 x6 : 0000000000000000\n    x5 : 0000000000000000 x4 : 0000000000000000 x3 : 0000000000000000\n    x2 : 0000000000000000 x1 : 0000000000000000 x0 : 0000000000000000\n    Call trace:\n     kobject_put+0x120/0x150\n     cdev_put+0x20/0x3c\n     __fput+0x2c4/0x2d8\n     ____fput+0x1c/0x38\n     task_work_run+0x70/0xfc\n     do_exit+0x2a0/0x924\n     do_group_exit+0x34/0x90\n     get_signal+0x7fc/0x8c0\n     do_signal+0x128/0x13b4\n     do_notify_resume+0xdc/0x160\n     el0_svc+0xd4/0xf8\n     el0t_64_sync_handler+0x140/0x14c\n     el0t_64_sync+0x190/0x194\n    ---[ end trace 0000000000000000 ]---\n\n...followed by more symptoms of corruption, with similar stacks:\n\n    refcount_t: underflow; use-after-free.\n    kernel BUG at lib/list_debug.c:62!\n    Kernel panic - not syncing: Oops - BUG: Fatal exception\n\nThis happens because pps_device_destruct() frees the pps_device with the\nembedded cdev immediately after calling cdev_del(), but, as the comment\nabove cdev_del() notes, fops for previously opened cdevs are still\ncallable even after cdev_del() returns. I think this bug has always\nbeen there: I can't explain why it suddenly started happening every time\nI reboot this particular board.\n\nIn commit d953e0e837e6 (\"pps: Fix a use-after free bug when\nunregistering a source.\"), George Spelvin suggested removing the\nembedded cdev. That seems like the simplest way to fix this, so I've\nimplemented his suggestion, using __register_chrdev() with pps_idr\nbecoming the source of truth for which minor corresponds to which\ndevice.\n\nBut now that pps_idr defines userspace visibility instead of cdev_add(),\nwe need to be sure the pps->dev refcount can't reach zero while\nuserspace can still find it again. So, the idr_remove() call moves to\npps_unregister_cdev(), and pps_idr now holds a reference to pps->dev.\n\n    pps_core: source serial1 got cdev (251:1)\n    <...>\n    pps pps1: removed\n    pps_core: unregistering pps1\n    pps_core: deallocating pps1",
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  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2024-57979"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/785c78ed0d39d1717cca3ef931d3e51337b5e90e"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/1a7735ab2cb9747518a7416fb5929e85442dec62"
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      "url": "https://git.kernel.org/stable/c/c4041b6b0a7a3def8cf3f3d6120ff337bc4c40f7"
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      "url": "https://git.kernel.org/stable/c/cd3bbcb6b3a7caa5ce67de76723b6d8531fb7f64"
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      "url": "https://git.kernel.org/stable/c/7e5ee3281dc09014367f5112b6d566ba36ea2d49"
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      "url": "https://git.kernel.org/stable/c/85241f7de216f8298f6e48540ea13d7dcd100870"
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      "url": "https://git.kernel.org/stable/c/c79a39dc8d060b9e64e8b0fa9d245d44befeefbe"
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  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-08-05T11:52:36Z"
  }
}